A dressed up winter swimmer jumps into the cold water during a traditional ice swimming session on December 23, 2012 in Lanke, some 50 kilometers north of Berlin. (Photo: AFP/Getty Images)

Ice Swimming: A Fun Activity

Dressed up winter swimmers enjoy the cold water during a traditional ice swimming session on December 23, 2012 in Lanke, some 50 kilometers north of Berlin. (Photo: AFP/Getty Images)

Ice Swimming: A Fun Activity

Dressed up winter swimmers enjoy the cold water during a traditional ice swimming session on December 23, 2012 in Lanke, some 50 kilometers north of Berlin. (Photo: AFP/Getty Images)

Ice Swimming: A Fun Activity

Dressed up winter swimmers enjoy the cold water during a traditional ice swimming session on December 23, 2012 in Lanke, some 50 kilometers north of Berlin. (Photo: AFP/Getty Images)

Ice Swimming: A Fun Activity

A dressed up winter swimmer enjoys the cold water during a traditional ice swimming session on December 23, 2012 in Lanke, some 50 kilometers north of Berlin. (Photo: AFP/Getty Images)

Ice Swimming: A Fun Activity

Dressed up winter swimmer prepare a hole in the icy surface of a lake for a traditional ice swimming session on December 23, 2012 in Lanke, some 50 kilometers north of Berlin. (Photo: AFP/Getty Images)

Ice Swimming: A Fun Activity

Dressed up winter swimmer prepare a hole in the icy surface of a lake for a traditional ice swimming session on December 23, 2012 in Lanke, some 50 kilometers north of Berlin. (Photo: AFP/Getty Images)

Ice Swimming: A Fun Activity

A dressed up winter swimmer prepares a hole in a lake for a traditional ice swimming session on December 23, 2012 in Lanke, some 50 kilometers north of Berlin. (Photo: AFP/Getty Images)

Ice Swimming: A Fun Activity

Rubber ducks of the winter swimmers stand in a row during a traditional ice swimming session on December 23, 2012 in Lanke, some 50 kilometers north of Berlin. (Photo: AFP/Getty Images)

Ice Swimming: A Fun Activity

A dressed up winter swimmer prepares a hole in a lake for a traditional ice swimming session on December 23, 2012 in Lanke, some 50 kilometers north of Berlin. (Photo: AFP/Getty Images)